WooHoo! I finally got it running on my mac! Wow, looks really great guys! Great job!
Here is how I got it working. I also posted this on the download wiki discussion page.
The key is to download and install libvorbis. I had some trouble with this, but then found out about Darwin Ports. The Darwin Ports system makes it easy to install many standard open source packages on a mac. Go to http://darwinports.org/getdp/
. Follow the instructions to download and install Darwin Ports. They are very clear.
Then install libvorbis as follows:
cd ~/darwinports/base (I don't know if this is needed but it is what I did)
sudo port install libvorbis (This installs the package you need)
sudo port install vorbis-tools (Again, not sure this is needed)
Now you need to put the Vorbis lib in the right place. Darwin ports puts libraries in /opt/local/lib/. FreeOrion wants them in /usr/local/lib/. Also FreeOrion calls the libvorbisfile library libvorbisfile.0.dylib. Darwin ports calls it a lot of things, but that isn't one them. So, these commands will sort things out:
ln -s libvorbisfile.dylib libvorbisfile.0.dylib
sudo ln ./* /usr/local/lib/
Lastly, running FreeOrion is not completely obvious. There are three executibles that seem to want to be run from the command line. One calls all the others, so just change directory to the location where you put FreeOrion and type ./freeorion. If everything goes well a window will open a FreeOrion will start up in all its glory.